Part names and functions of the quality ac dc power adaptor:
1: Varistor: The function of the varistor in the quality ac dc power adaptor is that when the external voltage is too high, the resistance of the varistor becomes very small rapidly, and the fuse connected in series with the varistor is blown to protect other circuits Not to be burned out.
2: Fuse: When the current in the circuit is too large, the fuse will blow to protect other components.
3: Inductance coil: The main function of the inductance coil in the quality ac dc power adaptor is to reduce electromagnetic interference.
4: Rectifier bridge: the function is to convert 220V AC into DC.
5: Filter capacitor: the function is to filter out the AC ripple in the DC power, making the circuit work more reliable.
6: Operational amplifier IC: an important part of protection circuit and voltage regulation.

7: Temperature probe: It is used to detect the internal temperature of the quality ac dc power adaptor. When the temperature is higher than a certain set value, the protection circuit will cut off the voltage output of the adapter to protect the adapter from damage.
8: High-power switching tube: It is one of the core components in the switching power supply. The switching power supply can work "one on and one off", and the switching tube is indispensable.
9: Switching transformer: one of the core components in switching power supply.
10: Secondary rectifier tube: the function is to change low-voltage alternating current into low-voltage direct current. In quality ac dc power adaptors, two rectifier tubes are often connected in parallel with high power to obtain a larger current output.
11: Secondary filter capacitor: There are two in total, which can filter out the ripple in low-voltage direct current.
In addition to the above-mentioned components, there are other components in the quality ac dc power adaptor, and the components of the quality ac dc power adaptor produced by different manufacturers will be different.